Fig. 2a. Anomaly correlation for 500-hPa geopotential, Northern Hemisphere
(20-80N) as a function of forecast length, for forecasts
verifying 10 Oct 2001 - 15 Apr 2002. MRF(black) is current model,
MRFX(blue) the new model and EC(red) is ECMWF model. Inset is for
various zonal wave numbers.